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Date: Tue, 02 Feb 2016 13:20:50 -0600 From: Bjorn Helgaas <bhelgaas@...gle.com> To: linux-pci@...r.kernel.org Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org Subject: [PATCH 3/3] PCI/PME: Restructure pcie_pme_suspend() to prevent compiler warning Previously we had this: if (wakeup) ret = enable_irq_wake(...); if (!wakeup || ret) ... "ret" is only evaluated when "wakeup" is true, and it is always initialized in that case, but gcc isn't smart enough to figure that out and warns: drivers/pci/pcie/pme.c:414:14: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized] Restructure the code slightly to make it easier for gcc (and maybe for humans as well). Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com> --- drivers/pci/pcie/pme.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c index 5695861..1ae4c73 100644 --- a/drivers/pci/pcie/pme.c +++ b/drivers/pci/pcie/pme.c @@ -396,7 +396,7 @@ static int pcie_pme_suspend(struct pcie_device *srv) { struct pcie_pme_service_data *data = get_service_data(srv); struct pci_dev *port = srv->port; - bool wakeup; + bool wakeup, wake_irq_enabled = false; int ret; if (device_may_wakeup(&port->dev)) { @@ -409,9 +409,12 @@ static int pcie_pme_suspend(struct pcie_device *srv) spin_lock_irq(&data->lock); if (wakeup) { ret = enable_irq_wake(srv->irq); - data->suspend_level = PME_SUSPEND_WAKEUP; + if (ret == 0) { + data->suspend_level = PME_SUSPEND_WAKEUP; + wake_irq_enabled = true; + } } - if (!wakeup || ret) { + if (!wake_irq_enabled) { pcie_pme_interrupt_enable(port, false); pcie_clear_root_pme_status(port); data->suspend_level = PME_SUSPEND_NOIRQ;
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